Diffrence between Active Directoy and Active Directory Services

I'm totally new in networking topics, so excuse my ignorance.

A friend of mine told me that there are two types of Microsoft active directories: one is named "local active directory" and the other is named "active directory services". The active directory services is created along with the local active directory.

He wants a web application in his company capable to authenticate users through both active directories. If user is local, then the web application should authenticate that user against the local active directory. If the web application detects that user is external, then it should authenticate it against the active directory services.

Your friend is mistaken; when you install Active Directory there is only one AD on a domain controller.

There are things like Active Directory Lightweight Directory Services (ADLDS) and AD Federation Services (ADFS) that your friend might have been thinking about but those are not the traditional Active Directory

"local active directory" and "active directory services" is one and the same thing.
Active directory services is just externsion to active directory to expand its usability across infrastructure services

Because most of the infrastructure services such as line of business applications (LOB), infrastructure servers such as email, FTP, Network storage and so on are using active directory to get autheticated, Microosft has renamed original active directory to "Active directory domain services" since windows 2008 server

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